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package com.demo;import java.security.MessageDigest;public class MD5Util { private static final String ALGORITHM = "MD5"; private static final char[] HEX_DIGITS = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘ }; /** * encode string * * @param algorithm * @param str * @return String */ public static String encode(String algorithm, String str) { if (str == null) { return null; } try { MessageDigest messageDigest = MessageDigest.getInstance(algorithm); messageDigest.update(str.getBytes()); return getFormattedText(messageDigest.digest()); } catch (Exception e) { throw new RuntimeException(e); } } /** * encode By MD5 * * @param str * @return String */ public static String getStringMD5String(String str) { if (str == null) { return null; } try { MessageDigest messageDigest = MessageDigest.getInstance(ALGORITHM); messageDigest.update(str.getBytes()); return getFormattedText(messageDigest.digest()); } catch (Exception e) { throw new RuntimeException(e); } } /** * Takes the raw bytes from the digest and formats them correct. * * @param bytes * the raw bytes from the digest. * @return the formatted bytes. */ private static String getFormattedText(byte[] bytes) { int len = bytes.length; StringBuilder buf = new StringBuilder(len * 2); // 把密文转换成十六进制的字符串形式 for (int j = 0; j < len; j++) { buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]); buf.append(HEX_DIGITS[bytes[j] & 0x0f]); } return buf.toString(); } public static void main(String[] args) { System.out.println(MD5Util.getStringMD5String("123"));// System.out.println("111111 MD5 :"// + EncoderHandler.encode("MD5", "111111"));// System.out.println("111111 SHA1 :"// + EncoderHandler.encode("SHA1", "111111")); }} |
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原文地址：http://www.cnblogs.com/mengyuxin/p/4813301.html
